adjectival clause

  edgood  —  Grammar Tips
First, a clause is a group of words with a conjugated verb in it. Second, an adjectival clause is a clause that modifies or describes a noun or pronoun. Note these adjectival clauses:
on the street where she lives the book that arrived at the store the book, which arrived at the store,
Adjectival clauses must be either restrictive or nonrestrictive. The that clause above is restrictive. The which clause is nonrestrictive. This complicated topic is described thoroughly in the eBook Developing a Powerful Writing Style. There you'll learn the differences between that and which.